Malicious PDF — malware analysis report

Static analysis result for SHA-256 a140142bd036c3e7…

MALICIOUS

PDF

85.5 KB Created: 2021-08-24 09:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb91f9ec78478526414f5bfd41d94aab SHA-1: df80a2fd2cebb59b68d46f7cc541f6b6389a6676 SHA-256: a140142bd036c3e7f123170358afdfaa79137bbfd02890d789afba964ef4665d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=photovoltaic+energy+production
    • http://mictrogiang.com/userfiles/files/fowogadufuver.pdf
    • https://miraclechuppahs.com/userfiles/file/77192557086.pdf
    • https://leganordavigliana.it/uploads/file/bigenunugoviguladuxebani.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/mudobetafizunimefed.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099f552d1503---92465434740.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a4d1989d---bitanuje.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2187545f54---83647566037.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/81701563254.pdf
    • https://banghenails.com/upload/file/tesefibesetuzof.pdf
    • http://www.bash.cl/media/file/16930516471.pdf
    • http://vmkmsz.hu/userfiles/file/52604042286.pdf
    • http://wjcopy.com/upload/files/bevimirifowozowagisukowi.pdf
    • http://pampa.be/uploads/userfiles/files/1925216614.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/1295230616.pdf
    • http://mindentudor.hu/userfiles/file/telid.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/31dc351127a8ea516e8c1dd2ef5e0ab1/67742116220.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sujubilituvudakuvedew.pdf
    • http://aldercrest.com/files/99461017916.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083788fd55b4---25487221247.pdf
    • http://naszymsladem.pl/upload/file/tabapugi.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e888e88b---55536266295.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933fabe6872---25675060945.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7fb.bin
bb6941134f63886e917f2c00d942727b80a36dd02094a635b7f846253b76778e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10904 bytes
font_01_sfnt_off00010105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 16792 bytes
font_02_sfnt_off00011917.bin
8a4c4bb25a62ca149034bca72b74d6e333c6741a65d03e4a664e98fbc5644159
pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 17160 bytes